diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/speed.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/speed.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/speed.c b/REORG.TODO/sysdeps/unix/sysv/linux/speed.c new file mode 100644 index 0000000000..c91be94af3 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/speed.c @@ -0,0 +1,97 @@ +/* `struct termios' speed frobnication functions. Linux version. + Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <stddef.h> +#include <errno.h> +#include <termios.h> + + +/* This is a gross hack around a kernel bug. If the cfsetispeed functions + is called with the SPEED argument set to zero this means use the same + speed as for output. But we don't have independent input and output + speeds and therefore cannot record this. + + We use an unused bit in the `c_iflag' field to keep track of this + use of `cfsetispeed'. The value here must correspond to the one used + in `tcsetattr.c'. */ +#define IBAUD0 020000000000 + + +/* Return the output baud rate stored in *TERMIOS_P. */ +speed_t +cfgetospeed (const struct termios *termios_p) +{ + return termios_p->c_cflag & (CBAUD | CBAUDEX); +} + +/* Return the input baud rate stored in *TERMIOS_P. + Although for Linux there is no difference between input and output + speed, the numerical 0 is a special case for the input baud rate. It + should set the input baud rate to the output baud rate. */ +speed_t +cfgetispeed (const struct termios *termios_p) +{ + return ((termios_p->c_iflag & IBAUD0) + ? 0 : termios_p->c_cflag & (CBAUD | CBAUDEX)); +} + +/* Set the output baud rate stored in *TERMIOS_P to SPEED. */ +int +cfsetospeed (struct termios *termios_p, speed_t speed) +{ + if ((speed & ~CBAUD) != 0 + && (speed < B57600 || speed > __MAX_BAUD)) + return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); + +#ifdef _HAVE_STRUCT_TERMIOS_C_OSPEED + termios_p->c_ospeed = speed; +#endif + termios_p->c_cflag &= ~(CBAUD | CBAUDEX); + termios_p->c_cflag |= speed; + + return 0; +} +libc_hidden_def (cfsetospeed) + + +/* Set the input baud rate stored in *TERMIOS_P to SPEED. + Although for Linux there is no difference between input and output + speed, the numerical 0 is a special case for the input baud rate. It + should set the input baud rate to the output baud rate. */ +int +cfsetispeed (struct termios *termios_p, speed_t speed) +{ + if ((speed & ~CBAUD) != 0 + && (speed < B57600 || speed > __MAX_BAUD)) + return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); + +#ifdef _HAVE_STRUCT_TERMIOS_C_ISPEED + termios_p->c_ispeed = speed; +#endif + if (speed == 0) + termios_p->c_iflag |= IBAUD0; + else + { + termios_p->c_iflag &= ~IBAUD0; + termios_p->c_cflag &= ~(CBAUD | CBAUDEX); + termios_p->c_cflag |= speed; + } + + return 0; +} +libc_hidden_def (cfsetispeed) |